Younger Dryas cold event

Target entity: Younger Dryas cold event
Context triple: [Quaternary period, contains, Younger Dryas cold event]

• A. 8.2 kiloyear event
  The 8.2 kiloyear event was a sudden, short-lived global cooling episode during the early Holocene, likely triggered by massive meltwater outbursts disrupting North Atlantic ocean circulation.
• B. 4.2 kiloyear event
  The 4.2 kiloyear event was a major global climatic downturn around 2200 BCE, marked by widespread aridification and cooling that is thought to have contributed to the collapse or transformation of several ancient civilizations.
• C. Holocene climatic optimum
  The Holocene climatic optimum was a warm period roughly 9,000–5,000 years ago when global temperatures, especially in the Northern Hemisphere, were higher than today, influencing the spread of forests and early human civilizations.
• D. Cenozoic glaciations
  Cenozoic glaciations are a series of major ice age cycles during the Cenozoic Era that saw extensive growth and retreat of continental ice sheets, profoundly shaping Earth’s climate and landscapes.
• E. Wisconsin glaciation
  The Wisconsin glaciation was the last major advance of continental ice sheets in North America during the Pleistocene, profoundly reshaping the continent’s landscapes and drainage systems.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: Younger Dryas cold event
Target entity description: The Younger Dryas cold event was a brief, abrupt return to near-glacial conditions about 12,900–11,700 years ago that interrupted the general warming trend at the end of the last Ice Age.

• A. 8.2 kiloyear event
  The 8.2 kiloyear event was a sudden, short-lived global cooling episode during the early Holocene, likely triggered by massive meltwater outbursts disrupting North Atlantic ocean circulation.
• B. 4.2 kiloyear event
  The 4.2 kiloyear event was a major global climatic downturn around 2200 BCE, marked by widespread aridification and cooling that is thought to have contributed to the collapse or transformation of several ancient civilizations.
• C. Holocene climatic optimum
  The Holocene climatic optimum was a warm period roughly 9,000–5,000 years ago when global temperatures, especially in the Northern Hemisphere, were higher than today, influencing the spread of forests and early human civilizations.
• D. Cenozoic glaciations
  Cenozoic glaciations are a series of major ice age cycles during the Cenozoic Era that saw extensive growth and retreat of continental ice sheets, profoundly shaping Earth’s climate and landscapes.
• E. Wisconsin glaciation
  The Wisconsin glaciation was the last major advance of continental ice sheets in North America during the Pleistocene, profoundly reshaping the continent’s landscapes and drainage systems.
• F. None of above. chosen